Steam-boiler furnace



(No Model.)

L. LAWTON.

STEAM BOILER FURNACE. No. 491.570. Patented Febi 14, 1893.

3 i ig- Ba 79 li? 4.

UNrrnn STATES PATENT rrrca LEWIS LAVVTON, OF TRENTON, NEW JERSEY.

STEAM-BOILER FURNACE.

SPECIFICATION forming part of Letters Patent No. 491570, dated February 14, 1893.

Application filed June 9, 1890. Renewed November 3, 1892. Serial No.450,822. (No model.)

To all whom 't may concern:

Be it known that I, LEWIS LAWTON, a citizen of the United States, residing at Trenton, in the County of Mercer and State of New Jersey, have invented certain new and useful Improvements in Steam-Boiler Furnaces; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to an inproved Construction of furnace, designed especially for use iu connection with steam boilers, though some of its features are adapted for other furnaces.

It has for its object to obtain a maximum degree of heat from a minimum amount of fuel, and to this end it consists in the novel Construction hereinafter described and claimed, Whereby the products of conbustion, after leaving the fire-pot and passing over the bridge-Wall, are fed with air taken in through peculiarly arranged fiues and delivered thereto in a highly heated condition, the products being then deflected under an arch some distance beyond the bridge-Wall, at or about which point a further snpply of air is introduced, whereby the escape of the products is retarded and a thorough commingling of the air supply therewith is insured; from which results a more complete combustion and consumption of the gaseous products, greater economy in the use of fuel, a more intense heat with less smoke, and, generally, an increased efficency in the furnace.

In the accompanying drawings forming a part of this specification, Figure l, is a longitudinal vertical section; Fig. 2, is a front elevation; Figs. 3 and 4, are vertical transverse sections on the lines 3-3 and ir-4:, respectively, Fig. 1; and Figs. 5 and 6, are detailed views of the bricks or slabs With which the arch is forned.

Like letters denote the same parts in the several Views.

A is a steamboiler of any preferred form or structure, that shown being of the common, cylindrical, tubular type.

B is the fire-box, underlying as usual the front end of the boiler;

C denotes the usual grate-bars, and Dthe ash-pit beneath.

D, D', D are the doors ordinarily provided, and E is the bridge-Wall, located at the rear\ end of the fire-box, as usual, extending con- 5 siderably above the grate-bars, and reaching to near the under side of the boiler, the construction and arrangement of parts thus far described not being unlike that in common use in this type of boiler furnaces.

Formed in the brick-Work inclosing the boiler, on either side of the fire-box, are the airsupply fiues K, opening at their front ends at J, on either side of the door D', at about the level of the front ends of the grate-bars, and extending at their rear to and beyond the bridge-wall. These fiues are provided with partitions K', arranged alternately as shown, those from the top of the fiues extendng to near the bottom thereof, and those rising from the bottom eXtending to near the top.

Inthe bridge-Wall, near its upper edge, is formed the air-chamber or passage H, extending from end to end of the wall and communicating at each end With the fiues K near the rear ends thereof. This passage is provided along its length with outlet openings M arranged horizontally and opening into the smoke-fine in rear of the bridge-wall. At some little distance in rear of the bridge-wall is' the partition F, its lower end being arched as shown, and extending slightly below the upper edge of the bridge-Wall. The arch of this partition is made up of the bricks or slabs E and E', the upper ones E being cut away on their under sides at the center, as at e, and the lower ones E' being out out on their upper sides, as shown at e', for a purpose to be presently described. As before stated, the airfiues at the side extend beyond the bridge- Wall and terninate at a point opposite the ends of the arched partition F. Between the bridge-wall and this partition these side fiues communicate with the smoke-fine by small openings N. The arch F is provided With an air-chamber or passage G, extending throughout its length and communicating with the air-fiues K at the sides of the furnace at their rear ends. This air-passage is Conveniently formed by the cut away portions e and e' in IOO i the bricks composing the arch, the cut away portions register-ing with each other When the bricks are placed in position one upon the other, and forning the passage G. In one side of each of the lower bricks E' is cut the vertical channel d, which, when the bricks are in position and the arch completed, form outlet openings from the passage, similar to the openings leading from the passage'in the bridge-wall.

The Construction being as above described, the products of combustion passing over the upper edge of the bridge-wall impi'nge against, and are defiected downward, and broken up by the arch F. As they pass the bridge-wall they are supplied from the under side With fresh air, drawn in through the uesK at the side of the fire-box and discharged through the openings M in the air-passage H. The small openings N in the sides of the fiues K aiord an additional supplyof fresh air at the sides. Passing on under the arch F the gasecus products are again supplied with air from above through the openings d leading from the passage Gr in the arch. The fiues K, being located in the side walls of the fur- 'nace contiguous to the fire-box and extend- S0O Fahrenheit, and this Construction is well ing along the smoke-fine, cause the air-supply passing therethrough to be delivered in a highly heatfed condition. The months J of these fiues may of course be provided with suitable draft regulators to increase or diminish the amount of fresh air admitted. The partitions K' arranged in these fiues, as heretoi'ore described and shownform a circuitous passage for the air, practically lengthening the fiues and aft'ording extended heating surfaces against which the air impnges.

To ett'ect the best results, I have found that the air should be delivered at the points described from the side fiues, heated to about adapted to produce this result. The air carried through these side fiues and being heated to approximately this degree, then commingled with the gases in the conbustion chamber causes them to be thoroughly consumed and producing a white flame. The air thus highly heated is delivered at different points as described in finely divided currents, thereby causing an'active combustion of the unconsuned products, and insuring an intense heat with little or no loss from smoke &c

What I claim and desire'to secure by Letters Patent is;-

1. In a furnace, the combination of the fire box, the bridge-wall reaching above the grate bars, the arch in rear of the wall extendi ng below its upper edge, the ai'f fl ues in the sidewalls of the furnace, the air-chambers in the bridge-wall and the arch, communicating with the side fiues and opening into the smoke flue,'and the openings N, leading fromthe side fiues into the rear of the conbustion chamber between the .bridge-wall and the arch, substantially as described. i V 2. In a steam-boil'er furnace, the combination of the fire-box, the bridge-wall, the arch in rear of the latter, the air-fiues in the side walls of the furnace having the partitions K', the air-passages in the bridge-Wall and the arch, communicating at their ends with the air fiues and opening into the smoke fiue, and the openings N, whereby the air-fiues communicate with the smoke fine between the bridgewall and the arch, substantially as described.

3.' In a stearn boiler furnace, the combination of the fire-box, the bridge-wall, the airfiues in the side walls of-the furnace, and the arch in rear of the bridge-wall, said arch being formed ot' the bricks' E and' n /"cut away' on their adjacent faces as at e, and e', to form the air-passage G oommunicat-ing With the air-fiues and openinginto the smoke-fine, substantialiy as described.

In testimony whereof I affix my signature in presence of two witnesses.

LEWIS LAWTON.

Witnesses:

J os. L. WATsoN, v L. SCHOONOVER. 

